Created
December 5, 2019 19:17
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Shell script to update AWS Route53 Record Set with current dynamically assigned IP address.
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#!/bin/bash | |
# Use of this script relies on the AWS CLI tool being installed. More | |
# information on this command line tool here: | |
# https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-welcome.html | |
# (optional) You might need to set your PATH variable at the top here | |
# depending on how you run this script | |
#PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin | |
echo "starting update-route53-record.sh" | |
# Hosted Zone ID e.g. BJBK35SKMM9OE | |
ZONEID="YOUR-ZONE-ID-GOES-HERE" | |
# The CNAME you want to update e.g. hello.example.com | |
RECORDSET="YOUR-HOSTNAME-GOES-HERE" | |
# The AWS CLI Named Profile value. If not using a profile, enter "default" | |
AWSPROFILE="YOUR-PROFILE-NAME-GOES-HERE" | |
# More advanced options below | |
# The Time-To-Live of this recordset | |
TTL=300 | |
# Change this if you want | |
COMMENT="Auto updating @ `date`" | |
# Change to AAAA if using an IPv6 address | |
TYPE="A" | |
# Get the external IP address from OpenDNS (more reliable than other providers) | |
IP=`dig +short myip.opendns.com @resolver1.opendns.com` | |
echo "$IP" | |
function valid_ip() | |
{ | |
local ip=$1 | |
local stat=1 | |
if [[ $ip =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then | |
OIFS=$IFS | |
IFS='.' | |
ip=($ip) | |
IFS=$OIFS | |
[[ ${ip[0]} -le 255 && ${ip[1]} -le 255 \ | |
&& ${ip[2]} -le 255 && ${ip[3]} -le 255 ]] | |
stat=$? | |
fi | |
return $stat | |
} | |
# Get current dir | |
# (from http://stackoverflow.com/a/246128/920350) | |
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" | |
LOGFILE="$DIR/update-route53.log" | |
IPFILE="$DIR/update-route53.ip" | |
echo "$IPFILE" | |
if ! valid_ip $IP; then | |
echo "Invalid IP address: $IP" >> "$LOGFILE" | |
exit 1 | |
fi | |
# Check if the IP has changed | |
if [ ! -f "$IPFILE" ] | |
then | |
touch "$IPFILE" | |
fi | |
if grep -Fxq "$IP" "$IPFILE"; then | |
# code if found | |
echo "IP is still $IP. Exiting" >> "$LOGFILE" | |
exit 0 | |
else | |
echo "IP has changed to $IP" >> "$LOGFILE" | |
# Fill a temp file with valid JSON | |
TMPFILE=$(mktemp /tmp/temporary-file.XXXXXXXX) | |
cat > ${TMPFILE} << EOF | |
{ | |
"Comment":"$COMMENT", | |
"Changes":[ | |
{ | |
"Action":"UPSERT", | |
"ResourceRecordSet":{ | |
"ResourceRecords":[ | |
{ | |
"Value":"$IP" | |
} | |
], | |
"Name":"$RECORDSET", | |
"Type":"$TYPE", | |
"TTL":$TTL | |
} | |
} | |
] | |
} | |
EOF | |
# Update the Hosted Zone record | |
# https://docs.aws.amazon.com/cli/latest/reference/route53/change-resource-record-sets.html | |
aws route53 change-resource-record-sets \ | |
--profile $AWSPROFILE \ | |
--hosted-zone-id $ZONEID \ | |
--change-batch file://"$TMPFILE" >> "$LOGFILE" | |
echo "" >> "$LOGFILE" | |
# Clean up | |
#rm $TMPFILE | |
fi | |
# All Done - cache the IP address for next time | |
echo "$IP" > "$IPFILE" |
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